Optical photographing lens assembly, image capturing device and electronic device

Abstract

An optical photographing lens assembly includes, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element and a sixth lens element. The first lens element with positive refractive power has an object-side surface being convex in a paraxial region thereof. The second lens element has refractive power. The third lens element has refractive power. The fourth lens element has refractive power. The fifth lens element with refractive power has an image-side surface being convex in a paraxial region thereof, wherein an object-side surface and the image-side surface of the fifth lens element are both aspheric. The sixth lens element with refractive power has an object-side surface and an image-side surface being both aspheric. The optical photographing lens assembly has a total of six lens elements with refractive power.

What is claimed is: 
     
       1. An optical photographing lens assembly comprising, in order from an object side to an image side:
 a first lens element with positive refractive power having an object-side surface being convex in a paraxial region thereof; 
 a second lens element; 
 a third lens element; 
 a fourth lens element; 
 a fifth lens element with positive refractive power having an image-side surface being convex in a paraxial region thereof, wherein an object-side surface and the image-side surface of the fifth lens element are both aspheric; and 
 a sixth lens element having an object-side surface and an image-side surface being both aspheric; 
 wherein the optical photographing lens assembly has a total of six lens elements, there is an air space between every two lens elements of the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element and the sixth lens element that are adjacent to each other, and there is no relative movement among the lens elements, the optical photographing lens assembly further comprises a stop located between an imaged object and the third lens element, a focal length of the optical photographing lens assembly is f, a maximum image height of the optical photographing lens assembly is ImgH, a curvature radius of the image-side surface of the fifth lens element is R 10 , and the following conditions are satisfied:
   2.0< f /ImgH; and 
   −1.25 <R 10 /f <0;
 
 
 wherein an Abbe number of the first lens element is V 1 , an Abbe number of the second lens element is V 2 , an Abbe number of the third lens element is V 3 , an Abbe number of the fourth lens element is V 4 , an Abbe number of the fifth lens element is V 5 , an Abbe number of the sixth lens element is V 6 , wherein at least two of the V 1 , V 2 , V 3 , V 4 , V 5  and V 6  are smaller than 27. 
 
     
     
       2. The optical photographing lens assembly of  claim 1 , wherein the second lens element has negative refractive power. 
     
     
       3. The optical photographing lens assembly of  claim 2 , wherein the image-side surface of the sixth lens element comprises at least one convex shape in an off-axial region thereof. 
     
     
       4. The optical photographing lens assembly of  claim 3 , wherein a half of a maximal field of view of the optical photographing lens assembly is HFOV, and the following condition is satisfied:
   10.0 degrees<HFOV<25.0 degrees. 
 
     
     
       5. The optical photographing lens assembly of  claim 3 , wherein both of the object-side surface and the image-side surface of each of the first lens element, the second lens element, the third lens element and the fourth lens element are aspheric; the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element and the sixth lens element are all made of plastic material; the focal length of the optical photographing lens assembly is f, the maximum image height of the optical photographing lens assembly is ImgH, and the following condition is satisfied:
   2.15 <f /ImgH<3.5. 
 
     
     
       6. The optical photographing lens assembly of  claim 3 , wherein the image-side surface of the sixth lens element is concave in a paraxial region thereof. 
     
     
       7. The optical photographing lens assembly of  claim 3 , wherein a sum of axial distances between each two lens elements of the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element and the sixth lens element which are adjacent to each other is ΣAT, an axial distance between the first lens element and the second lens element is T 12 , an axial distance between the second lens element and the third lens element is T 23 , and the following condition is satisfied:
   5.0 <ΣAT /( T 12 +T 23). 
 
     
     
       8. The optical photographing lens assembly of  claim 3 , wherein an axial distance from the object-side surface of the first lens element to the stop is Dr 1 s, an axial distance from the stop to an image-side surface of the first lens element is Dsr 2 , and the following condition is satisfied:
   0.60 <Dr 1 s/Dsr 2. 
 
     
     
       9. The optical photographing lens assembly of  claim 1 , wherein the image-side surface of the third lens element is concave in a paraxial region thereof. 
     
     
       10. The optical photographing lens assembly of  claim 9 , wherein the focal length of the optical photographing lens assembly is f, an axial distance between the object-side surface of the first lens element and an image surface is TL, and the following condition is satisfied:
   0.70 <TL/f< 1.15. 
 
     
     
       11. The optical photographing lens assembly of  claim 9 , wherein at least three surfaces of the object-side surface and the image-side surface of each of the first lens element, the second lens element, the third lens element, the fourth lens element and the fifth lens element have at least one inflection point. 
     
     
       12. The optical photographing lens assembly of  claim 11 , wherein an axial distance between the stop and an image surface is SL, an axial distance between the object-side surface of the first lens element and the image surface is TL, and the following condition is satisfied:
   0.85 <SL/TL< 1.05. 
 
     
     
       13. The optical photographing lens assembly of  claim 11 , wherein the focal length of the optical photographing lens assembly is f, the curvature radius of the image-side surface of the fifth lens element is R 10 , and the following condition is satisfied:
   −1.0 <R 10 /f<− 0.1.
 
 
     
     
       14. The optical photographing lens assembly of  claim 1 , wherein at least three lens elements of the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element and the sixth lens element have negative refractive power. 
     
     
       15. An image capturing device, comprising:
 the optical photographing lens assembly of  claim 1 ; and 
 an image sensor, wherein the image sensor is disposed on an image surface of the optical photographing lens assembly. 
 
     
     
       16. An electronic device, comprising:
 the image capturing device of  claim 15 . 
 
     
     
       17. An optical photographing lens assembly comprising, in order from an object side to an image side:
 a first lens element with positive refractive power having an object-side surface being convex in a paraxial region thereof; 
 a second lens element; 
 a third lens element; 
 a fourth lens element; 
 a fifth lens element with positive refractive power having an image-side surface being convex in a paraxial region thereof, wherein an object-side surface and the image-side surface of the fifth lens element are both aspheric; and 
 a sixth lens element having an image-side surface being concave in a paraxial region thereof, wherein an object-side surface and the image-side surface of the sixth lens element are both aspheric, and the image-side surface of the sixth lens element comprises at least one convex shape in an off-axial region thereof; 
 wherein the optical photographing lens assembly has a total of six lens elements, there is an air space between every two lens elements of the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element and the sixth lens element that are adjacent to each other, and there is no relative movement among the lens elements, the optical photographing lens assembly further comprises a stop located between an imaged object and the third lens element, a focal length of the optical photographing lens assembly is f, a maximum image height of the optical photographing lens assembly is ImgH, a curvature radius of the image-side surface of the fifth lens element is R 10 , and the following conditions are satisfied:
   2.0< f /ImgH; and 
     R 10 /f< 0; 
 
 wherein an Abbe number of the first lens element is V 1 , an Abbe number of the second lens element is V 2 , an Abbe number of the third lens element is V 3 , an Abbe number of the fourth lens element is V 4 , an Abbe number of the fifth lens element is V 5 , an Abbe number of the sixth lens element is V 6 , wherein at least two of the V 1 , V 2 , V 3 , V 4 , V 5  and V 6  are smaller than 27. 
 
     
     
       18. The optical photographing lens assembly of  claim 17 , wherein both of the object-side surface and the image-side surface of each of the first lens element, the second lens element, the third lens element and the fourth lens element are aspheric, the first lens element, the second lens element, the third lens element, the fourth lens element, the fifth lens element and the sixth lens element are all made of plastic material. 
     
     
       19. The optical photographing lens assembly of  claim 17 , wherein an axial distance from the object-side surface of the first lens element to the stop is Dr 1 s, an axial distance from the stop to an image-side surface of the first lens element is Dsr 2 , and the following condition is satisfied:
   0.60< Dr 1 s/Dsr 2.